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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedd5670a87371ee2f34863f6a61421f5f387d9c6fc21e4a11f9cdce3fe08ac8' 
  AND token = 'ypuh4x+m3RZYlYPIJafDR3YU1gueLRMuv9O5YERv0uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}